I guess this also means the relative value of a slog is also limited by the amount memory that can be allocated to the txg.
On Wed, May 20, 2009 at 4:03 PM, Eric Schrock <eric.schr...@sun.com> wrote: > > Yes, that is correct. It is best to think of the ZIL and the txg sync > process as orthogonal - data goes to both locations at different times. The > ZIL (technically "all ZILs" since they're per-filesystem) is *only* read in > the event of log replay (unclean shutdown). During normal operation it is > never read. Hence the benefit of write-biases SSDs - it doesn't matter if > reads are fast for slogs. >
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